A practical method to estimate crack openings in concrete structures

Matallah, Mohammed; Borderie, Christian La; Maurel, Olivier

doi:10.1002/nag.876

Cited by 77 publications

(57 citation statements)

References 14 publications

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“…21, the crack opening fields are illustrated for different ages. The crack opening computation was performed using the post-processing method developed by Matallah et al [31,20] which allows to calculate crack openings from a nonlinear damage or plasticity model. For all beams, the crack patterns show that, at the displacement limit fixed to perform inverse analysis, the crack does not reach the boundary limit and the fracture process is not strongly disturbed by the boundary effects.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

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Size-independent fracture energy of concrete at very early ages by inverse analysis

Matallah

Farah

Grondin

et al. 2013

Engineering Fracture Mechanics

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This paper deals with the analysis of fracture characteristics of concrete at very early ages. Experimentally, three-point bending tests are performed on concrete notched beams at very early age (before 24 h) to obtain the Load-Crack Mouth Opening Displacement (CMOD) curves. In order to find a trend of the fracture energy evolution, inverse analysis procedure is performed using finite element analysis. A damage softening model is used to describe the softening behaviour and a nonlinear inverse analysis algorithm (Levenberg-Marquardt) is adopted. As the softening damage model used does not take into account boundary effects, only a part of the Load-CMOD curves is fitted. Therefore, a good estimation of the size-independent fracture energy is obtained. The results obtained from the experimental test and the inverse analysis indicate an upward trend of the evolution of the fracture energy and other fracture concrete characteristics.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

“…The proposed fracture energy regularisation is tested on a simple uniaxial tension test [20]. The test consists in a simple bar with length 1 m and a width 0.1 m (Fig.…”

Section: Energetic Regularization For One Dimensional Analysismentioning

confidence: 99%

Size-independent fracture energy of concrete at very early ages by inverse analysis

Matallah

Farah

Grondin

et al. 2013

Engineering Fracture Mechanics

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“…Crack openings and orientations in each FE, needed to compute the total leakage rate, are obtained according to (Jourdain 2014) following (Matallah et al 2010). In Fig.…”

Section: Air Leakage Modelmentioning

confidence: 99%

Special Issue: Aging Management of Nuclear Power Plant

Maruyama¹

2016

ACT

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PrefaceEven after the accident of the Fukushima Daiichi Nuclear Power Plant, the Japanese government has positioned nuclear power as an important base load power source in terms of energy policies and has focused on safety operation of the nuclear power generation. This is because it is an indispensable power source for the use of renewable energy in Japan with limited resources. On the other hand, the first generation commercial reactors in the world generally have a designed life of 30 to 40 years, but most of them have been in existence for more than 20 years. Japan is no exception, and several NPPs aged already more than 40 years.Analysis and research show that many commercial reactors leave enough capacity to operate beyond the designed service period. Replacement of the concrete members used in the reactor buildings is expensive making it difficult in many cases. Therefore, in order to continue nuclear power generation over the long term, it is necessary to maintain the performance of the concrete member during the designed service period. From this point of view, it is indispensable to conduct research on maintenance management, performance evaluation, and prediction of deterioration of concrete structures.Research on concrete in the field of civil engineering and building science has been conducted for a long time, while reevaluation of concrete performance, physical properties and various problems in terms of nuclear field needs, i.e. Plant Life Management and Ageing Management, and addressing issues peculiar to the nuclear power field will be an important contribution from the field of concrete research to the field of nuclear power engineering. As discussed at OECD / NEA, alkali silica reactions and radiation influence are important issues for the maintenance of nuclear power plants, and many research on them has been reported.Also in the past, research investment on concrete in the field of nuclear power has been carried out many times in Japan as well as in other developed countries. However, the international publication of the research results has been limited. In this ACT special issue, especially on advanced research in recent years, I widely urged stakeholders to make efforts to allow research trends in Japan to be forecast from other countries.Based on these backgrounds, we applied for papers focusing on Plant Life Management at nuclear power plant facilities and related technologies in the research related to concrete. I think that it became a State of the Art report, which highlights the current problems. I also anticipate it could lead to a trust from the society concerning future nuclear power generation technology and a development of the concrete research field. AbstractA review of the current state of knowledge on the effects of radiation on concrete in nuclear power production applications is presented. Emphasis is placed on the effects of radiation damage, as reflected by changes in engineering properties of concrete, in the evaluation of the long-term operation and for plant life or...

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“…We assume in the following that the softening of concrete in tension can be correctly depicted by means of a coupled elastoplastic damage model that uses a crack band approach. The model initially developed by Fichant et al [12] was recently modified in order to better take into account the fracture energy [13]. It is implemented in the recent versions of Cast3M [14] and known as "MICROISO".…”

Section: Tensile Strengthmentioning

confidence: 99%

influence of Moisture and Temperature on Mechanical Properties of the Concrete

Kallel

Carré

Laborderie

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract. The scenario of a severe accident in the containment building of a nuclear plant results in an increase in pressure, temperature and relative humidity that can reach respectively 5 bars, 140 C and the water vapour saturation. Accurate knowledge of the thermal and mechanical behaviour of materials and more specifically of concrete is required to carry out more precise numerical simulations, in order to be able improve the precision of regulatory calculations.Our study aims to investigate the mechanical behaviour of concrete under homogeneous conditions of moisture and temperature. An experimental apparatus was designed in order to assess the evolutions of the fracture energy, the modulus of elasticity and the traction resistance of concrete. Different temperature levels up to a maximum of 140 C and at different values of the controlled moisture content were investigated. The equipment was used to perform DCT (Disk-shape Compact Tension) tests at 30, 90, 110 and 140 C. Five levels of degree of liquid water saturation ( S w ) were investigated for each temperature level between 36 and 100 %.

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A practical method to estimate crack openings in concrete structures

Cited by 77 publications

References 14 publications

Size-independent fracture energy of concrete at very early ages by inverse analysis

Size-independent fracture energy of concrete at very early ages by inverse analysis

Special Issue: Aging Management of Nuclear Power Plant

influence of Moisture and Temperature on Mechanical Properties of the Concrete

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